Centrifugal pump.



H. A. lRINDLE. GBNTRIFUGAL PUMP. APPLIGATION HLED AUG. s, 1907.

Patented May 24, 1910.

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VH. A. PRINDLE.

GENTRIIUGAL PUMP. APPLICATION FILED AUG. e, 1901.

Patented May 24, 1910.

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H. A. PRINDLE. CENTRIFUGAL PUMP. APP'LIUATION FILED Arme. 1907.

Patented May 24, 1910.

5 SHEETS-SHEET 3.

@miic/:aeg: 77%@ H. A. PRINDLE. GBNTRIFUGAL PUMP. APPLIGATION FILED AUG. s, 1907.

Patented May 24, 1910.

5 SHEETS-SHEET 4.

H. A. PRINDLE.

GENTRIFUGAL PUMP. a

APPLICATION FILED AUG. s, 1907.

Patented May 24, 1910.

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cEN'rnrEUGAL PUMP.' p

' sommation orteaer's raam. Patented May 24., 1910.

` Application-filed August 6, l1907. Serial No. 387,331.

To all whom 'it may concern:

Be it known that I, HARRY A. PRINDLE of Philadel hia, in the county of Philadelp ia and in the State of Pennsylvania, have invented a certain new and useful Improvement in Centrifugal Pumps, and do hereby declare that the following'lA is a full, clear, and exact description t ereof, reference being had to the accompanying drawings, in which- Figures 1 and 2 are respectively a side and an end elevation of a pump embodying myinvention. Fig. 3 is a section on the ligne 3 3 Fig. 1. Fig. 4 is al section on the hne 4-4 Fig. 2; Figs. 5 and 6 are respectively end and side elevations of another embodiment of my invention. Fig. 7 is a section on the -line 7-7 Fig. 5. Fig. 8 is a section on the line 8-8 Fig. 6. Figs. 9 and 10 are res ectively a side elevation and an end elevation ofanother embodiment of my inven' tion. Fig. 11 is a section on the line 11- 11 12-12 Fig. 10. Fig. 13 isa side elevation of the lower portion of half a pump, constitutin another embodiment of my invention, igs. 14, 15 and 16 are respectively a central longitudinal view and opposite end elevations, artly in section, ofA another embodiment oi) my invention, and Figs. 17 and a vertical longitudinal sectional view, an a vertical transverse sectional view of another embodiment of my provide 'a centrifugal pump invention.

The object of my invention has been to among others the advantage of having wa ter passages for conve ing water from the runners, so constructed1 that they shall result in a minimum loss of energy, the water being conducted -by a directroute, and in passages so pro ortioned that 'the pressure and velocity o the water shall be maintained substantially uniform, and to such .ends my invention consistsl in the centrifugapump hereinafter specified.

y invention can be embodied in many different forms. That form of my invention whicheis illustrated in Figs. 1 to 4 n elusive has a base A that supports one section B of the pump casingz the section being preferably `cast integral wlth the base. l The 9. Fig. 12 is a section on the' linethat shall have casing is completed by another section B', the sections formin between them a cham ber for the runner the said runner being mounted upon a shaft in the usual manner and 'therefore not necessary to be described.V 'The runner consists of -the usual side-plates connected by spiral blades or vanes. 'The entrance for the Water in this instance is the opening bz in--the casing section B', w ich opening is concentric with the shaft. The water after passing through the runner passes through diifusing passa es formed between diffusion vanes charge chamber or passage' b3 with which said passages communicate. It is in the form of the discharge passage b3 sultant advantages that my invention chiefly lies. The passage b consists,- in the resent instance, of two branches. beginning 1n the lower art- .of the pump in line with the mouths the diffusing nozzles or pasthrough ,sages b", the space between the said branches bem-grilled in by a, art a of the casing.

These branches of t e discharge passageturn the water gradually and smoothly away from the central and convey it toward t e discharge outlet b. The branches of the discharge passage g'raduall increase in area as they pass successive ischarge nozzles to accommodate the increasing volume of water so as prefer ably neither to increase nor decrease either the ressure or velocit of the water as it is rece1ved from the disc arge nozzles; but in any event, every cross-section is so chosen that there will be no unintentional increase or decrease of pressure or velocity. In the operation of the present form o my invention, the water enters the inlet b2, and through the action of the buckets or ribs of the runner is given a strong outward impetus. It leaves the runner. substantially tangent to the diffusion lvaries and passing through the discharge nozzles between such vanes enters one'or the.other branch b of the discharge passage, where it is turned by the most direct route to the outlet b. By this means the water is always under con trol, and fiowsin direct and certain lines, and expends no substantial part of.. its energy in the formation of -eddies. Thls is Ynot true of lformer pumps where the dislane ofthe pump,.

and its re- 85 which are duplicates of eacl 4o vanes b", and arriving through twin volute discharge passages-as a struction is substantially so vided by 1 the exit b 65 action, tends substantially the same as in Figs cept that the branches D of the twin volute 1-0 With my dischar e passage, which may be termed a twin vo utc passage, the waterway gradually increases in area to accommo- A date additional streams of water issuing from successive diffusing nozzles, so that the i6 pressure and velocit are maintained as desired, thereby avoi ing iuctuations which would otherwise impair the eiiciency by the formation of eddies. My twin volute also results in a decrease of the size of the pump 20 since there is no waste space,V but 'ust area suicient to roperly conduct the ischarging Water. his results in a reduction of the surface exposed to friction and a further gain in eicienc My constructionof pump lowers the cen- 'ter of gravity as compared with the old construction, which reduces vibration, and size, weight and cost of the pump.

In that embodiment o f my invention illus- 80 trated in Figs. 5 to 8 inclusive, the construction is sulzistantially.V the same, except that the pump is balanced by causing the water to enter a double runner from both sides.- sections B The base A. supports other. The water enters from below and is dividedinto passages b,from which it enters the double suction runner C from o posite sides, the water leaving the runner een diiusing at the outlet b before described.

In the form .of my invention which is illustrated in Figs. 9 to 12 inclusive, the conthe saine as that in Figs. 5 to 8, except that there is a diffus- .mg nozzle b between the diffusion vanes b at a central pointl at the bottom of the pum and the water from this single nozzle is 1- a diverter blade or lip b" so that 1t' iows each wai into the twin volute discharge passages 1 to the exit b". A dif.

nozzle b is formed directly under so that it, by an injector-like to suck or cause the water to AHow into the outlet from the two branches of the waterway.

In the form of m A .invention which is illustrated in Fig. 1

, the construction is 1 to 4, ex;

arge' are substantially uniform in crosssection from one di'using nozzle E to the branches f o 't e s *fusing nozzles la are formed,

Vthe water to a passa je 1nozzles ,c, and enters the second twin volute O, by' which means it 95 next diffusing. nozzle Eyinstead of being off' constantly increasing cross-section.

.In the form of my invention which is illustrated in Figs. 14 to 16, a double stage pump is shown. The pump consists of a ase F supporting one casing section G by a cylindrical boss or hub g that is inserted in a split rin carried by the base F, the

lit ring being drawn toub by a tension bolt f2.

g'ether aroundthe he case G consists of a chambered section g', closed by a: head g2, che shea H havingl is arings in such two' parts.- -The shaft carries. similar but reversed runners I, and there is a partition K that is interposed between the two casing sections and that divides it into two ruimer Chamb referably in the partition K, one set of di using nozzles for each runner. The water enters through an inlet L o'set from. the center of thecasing and formed in the casing section g2, and

passes through the first runner and thence through its diifusing nozzles into a twin volute passage M, as shown in Fig. 16; the branches of s uch passa e unite and convey veyed to the centra. inlet of the second runner. The water asses through the second runner, and t u h its diffusing ranches of the reaches the outlet P. As all the diiusing vanes and passages in this form of my invention are in the partition K, and as this partition is circular, the direction of rotation of the pump can be reversed by reversing the partition K and the runners in the casing. This form of my pump is balanced so that there is no Iend thrust to the'shaft.

It is obvious that my invention can be embodied in other forms than those I have illustrated, andI desire that my claims shall not be limited to the specific constructions by which I have chosen to illustrate the inventioi i.- For instance, I can, as illustrated in Fig. 17, provide onl three diiusing passages, the lower one reaching the outlet by a chamber R, which only. carries the 'flow from such nozzle or passage. The right -hand diffusing nozzle or assage S reaching the -outlet through itsc amber or passage T, which Aonly carries the water from the passage4 S,.and the third or upper diiusin nozzle or passage Y' opening directly towar the outlet.

I claim- 1. A pump having a. casing provided with an' inlet, a runner in said casing, an outlet substantiallyin the plane of the runner and at one side ofthe runner, and a discharge chamber for convey' ner tosaid outlet, said discharge chamber ers. Dif- 80 l whence itis conwater from said runhaving two separated branches extending from a point substantially on the opposite side of the periphery of said runner fromy said outlet; around said runner to said outlet, 2. A pump having a casing provided with an inlet, a runner insaid casing, an outlet substantially in the plane' of the runner, and a; discharge chamber for conveying water from said runner to said outlet, saiddischarge chamber having two separated branches extending from a point removed from said outlet to said outlet.

3. A pump having a casing provided with an inlet, a runne/r in saidcasing, an outlet substantially in the plane 'of the runner, a discharge chamber for conveying water' from said runner to said outlet, said discharge 'chamber having two separated branches extending from a point removed from said outlet to said outlet, and said branches radually increasing in cross-section in a 'irection toward said outlet.

4. A pump having a casing provided with an inlet, a runner in said casing, an outlet substantially in the plane of said runner, and a discharge passage -or conveying water from the runner tothe outlet, said discharge passage havlng .two separated branches,

eginning at a point on the opposite side of the runner from the outlet and extending to the outlet, and gradually increasing'in crosssection.

A pump having a casing provided with an inlet, a runner in the casing, diusion vanes around the runner, and a discharge chamber for receiving the water from saidvanes and conveying' it to an outlet, said discharge chamber being formed in two separated branches of increasing area of crosssection as the approach the outlet. The com ination of a pump casing, havmg an inlet and a discharge chamber, a shaft mounted in said casing, similar but reversed runners on said shaft, a reversible plate mounted in said casing between said runners, guide-vanes on opposite-sides of said plate, one set of varies directing water from the first runner to the second, and another set of vanes directing the water from the second runner to the outlet, whereby said plate can be reversed and the direction of rotation reversed.

7. The combination of a pump casing, hav ing an inlet and a discharge chamber, a shaft mounted in said casing, similar .but reversely placed runners on 'said shaft, areversible plate between said runners, v'anes on said plate forming diiusion nozzles for conveying water from said first impeller to said discharge chamber, said vanes forming two separated assages, beginning on the opposite side o the' impeller from the discharge chamber, and increasing 1n area as they extend toward the discharge chamber, said discharge chamber communicating with the inlet of the second impell'er, vanes ,formed on the opposite side of said plate, forming two separated passages communicating with the outlet, said passages be 'nning on the opposite side of said secon impeller from said 70 outletand increasing in area as they extend toward said outlet.

8. In a centrifugal pump, the combination of acasing, a shaft mounted therein, reversely placed runners mounted on said shaft, an inlet communicating with the rst runner, discharge passages for said runner, consisting of two separatedpassages increasing in area from the point of separation toward the dischargeto the second impeller, and two sepa-rated discharge passagesl for the second impeller, said last-mentioned di s charge passages having their point of separation substantially diametrically opposite from the point of separation of the similar passages for the first impeller,'said passages for the second impeller increasing in area in the direction toward the outlet. y

9. A pump -having a. casing provided with A an inlet', a runner in said casing, an outlet 9o substantially in the lane of the runner, .a

aving .two separated branches, beginning on the opposite side of the runner from the outlet and extending to the outlet, saidbran'ches increasing in area inl a direction toward .the outlet, diffusing nozzles connecting the runner chamber with -the discharge chamber, one of said nozzles being arranged in line with the point of separation between said two branches of the water Way .to divide the water discharged by itbetween the two branches of the waterway. f

10. A pump consisting of a casing, having I a plurality of runners in said casmg, passages for conveying 'water to the inlets of said runners from opposite sides, whereby to balance the pump, and discharge chambers having two separated branches each that rep spectively surround said runners, and said '110 branches-having. adually increasing crosssection in a direction toward their .respect-ive outlets, at which they meet. l A

11. A pum consisting of a casing having two runners t erein, an'inlet'to supply water 115 to one of said runners, a-'discharge chamber' for such runner consisting ofV two separated branches of gradually increasing cross-section toward a point Where they meet, an inlet assa e for the second runner connected 120 with sai discharge passage of the rst runner,'and'a discharge passage tor the second runner consisting of two separated branches v surrounding the runner, and of grad ually increasing cross-section in a direction toward the point where they meet. K

Correction. In LettersPatent No. 958,765.

l consistin of the within it difusing vanes l and passages col1n2birtttixritldf hguriiilerpa casing living a whereby the directlon of rotatlon canbe re-A water discharge chamber surrounding he versed i:by 4 'evermg the runners ,and said lurali of runners an a symme n ca par a 5 Ellicisildnallhgli tlhg oppostlte side of the run- In testimony that I clann the foregoing I 15 lner from said outlet extending substantially have hereunto-set m hand. i 1 to the eriphery of the runner. HA RY A. PRINDLIJ.

13. n a centrifu al ump the cornbina- Witnesses: tion of a casing, a. p u ity of runners and a EDWIN J. PRINDLE, 10 removable symmetrical part having lformed ANNANEWCOMB. A

It is hereby certified thatin Letters Patent No. 958,765, granted May 24, 1.910, upon the application of Harry A.Prindle, of Philadelphia, Pennsylvania, for anA improvement in Centrifugal Pumps, an error appears in the-printed specification requiring correction as follows: PageA 4, line et, the syllable and words .tion of a. casing, a plurality of runners should be. stricken out and the words runner, an outlet ji'om said claamer, be inserted instead; and that the said Letters Patent should be read with this correction ltherein' thatl the same may conform to the 'record of the case in the Patent Oilice.k t

Signed and sealed this 13th day of J une, A. D. 1911.

[SEAL] l Y C. C. BILLINGS,

` l I Acting Omnmzlssz'oner of.` Patents.'

Correction. In LettersPatent No. 958,765.

l consistin of the within it difusing vanes l and passages col1n2birtttixritldf hguriiilerpa casing living a whereby the directlon of rotatlon canbe re-A water discharge chamber surrounding he versed i:by 4 'evermg the runners ,and said lurali of runners an a symme n ca par a 5 Ellicisildnallhgli tlhg oppostlte side of the run- In testimony that I clann the foregoing I 15 lner from said outlet extending substantially have hereunto-set m hand. i 1 to the eriphery of the runner. HA RY A. PRINDLIJ.

13. n a centrifu al ump the cornbina- Witnesses: tion of a casing, a. p u ity of runners and a EDWIN J. PRINDLE, 10 removable symmetrical part having lformed ANNANEWCOMB. A

It is hereby certified thatin Letters Patent No. 958,765, granted May 24, 1.910, upon the application of Harry A.Prindle, of Philadelphia, Pennsylvania, for anA improvement in Centrifugal Pumps, an error appears in the-printed specification requiring correction as follows: PageA 4, line et, the syllable and words .tion of a. casing, a plurality of runners should be. stricken out and the words runner, an outlet ji'om said claamer, be inserted instead; and that the said Letters Patent should be read with this correction ltherein' thatl the same may conform to the 'record of the case in the Patent Oilice.k t

Signed and sealed this 13th day of J une, A. D. 1911.

[SEAL] l Y C. C. BILLINGS,

` l I Acting Omnmzlssz'oner of.` Patents.'

Correction' in LettersPatent No. 958,765.

It is hereby certified that in Letters Patent No. 958,765, granted May 24, 1910, upon the application of Harry A. Prindle, of Philadelphia, Pennsylvania, for an improvement in Centrifugal Pumps, an error appears in the printed speeication requiring correction as follows: Page 4, line 4, the syllable and words tion of a casing, a plurality of runners should be stricken outand the words runner, an millet from said chamber, be inserted instead; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 13th day of June, A. D. 1911.

[SEAL] C. C. BILLINGS,

Acting Umnmssz'oner of Patents. 

